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The paper presents a mathematical model describing the water temperature change in a buffer tank. The buffer tank is an integral part of modern greenhouse heating systems. The model includes heat fluxes from the heating boiler, heat fluxes transferred to the greenhouse interior and heat losses from the system (tank, pipes connecting the tank with the heating system). The differential method was used to determine the temperature value in the tank. Verification tests carried out in a real facility showed that the mean square error is 0.14K.

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